Helena of Znojmo (; ; c. 1141This date is preferred by Czech historiography; Polish historians promote the year 1145–1202/1206Jasiński K. (2004). Rodowód pierwszych Piastów. Poznań: Wydawnictwo PTPN. pp. 266–268. .), was a Bohemian princess, a member of the Přemyslid dynasty. She was the daughter of Duke Conrad II of Znojmo and his Serbian wife Maria (daughter of Uroš I). Helena was probably named after her maternal aunt, Queen Helena of Hungary, wife of King Béla II.According to Jan Długosz, Helen was a daughter of Rostislav Mstislavich, Grand Prince of Kiev. He erroneously deduced her parentage on the basis of her Russian-sounding name. This was corrected by more recent historiography.

Born as princess of the Znojmo Appanage (named after its centre, the town of Znojmo in southern Moravia), she later became by marriage Duchess of Sandomierz (1173-1194), Grand Duchess of Kraków and the Seniorate Province (1177-1194), Duchess of Masovia (1186–1194), and Duchess-regent of Kraków and the Seniorate Province, Sandomierz, and Masovia on behalf of her minor sons from 1194–1198, then the latter two duchies plus Kuyavia until 1199/1200.

Life Helen married Casimir II the Just, youngest son of Bolesław III Wrymouth, probably shortly after his return from captivity,K. Jasiński cit., pp.266–267 which at the latest was before 1161.

When Helen's husband Casimir II died on 1 May 1194, presumably as a result of a heart attack,Rafał Róg, Polish królobójcy, Warszawa 1994, p. 27 he left her with their two minor sons on whose behalf she assumed the regency of Kraków and the Seniorate Province, Sandomierz, and Masovia with blessings from the Fulko, bishop of Kraków, and the Kraków voivode.

Helen's regency was not an easy one, because other princes threatened her minor sons. Their own uncle Mieszko III the Old was after Kraków and the Seniorate Province. This situation between Helen and Mieszko III lasted until the Battle of Mozgawą in September 1195, in which Mieszko III was seriously injured and his son Bolesław of Kuyavia was killed. In 1198, they reached an agreement: Mieszko would take Kraków, in return for which he gave Helen and her sons Kuyavia (they retained Masovia and Sandomierz). Independent authority over the inheritance was assumed by the eldest son, Leszek the White, in 1199 or 1200. Helen's intelligence and character were recorded in the chronicle of Vincent Kadlubek, who knew the princess in person. According to him Helen was "a woman with greater wisdom than usually women have".

Helen of Znojmo died between 1202 and 1206, probably on 2 April.According to Jan Długosz, Helena was still alive on December 24, 1211. However, this date was challenged by Oswald Balzer. (2005) Genealogia Piastów. [1st pub. Akad. Umiejętności: 1895]. 2005. Kraków: Wydawnictwo Avalon. p. 327. .

Children Helen and Casimir had the following children:There is a very unlikely possibility, but which cannot be completely ruled out, that Helen was the second wife of Casimir the Just. But there is no mention about this in any of the primary sources. Hence this hypothesis is merely a logical structure, which reduces its credibility even more. Cf. Jasiński K., op. cit., p. 267

A daughter (born before 1167), married in November 1178 to Prince Vsevolod IV of Kiev. Casimir (ca. 1162 – 2 FebruaryK. Jasiński: Rodowód Piastów małopolskich i kujawskich, Poznań–Wrocław 2001, p. 14. or 1 March 1167), named after his father. Bolesław (ca. 1168/1171 – 16 April 1182/1183), probably named after his paternal grandfather Bolesław III Wrymouth, although is possible that in fact was named in honour to his uncle Bolesław IV the Curly.K. Jasiński: Rodowód Piastów małopolskich i kujawskich, Poznań–Wrocław 2001, p. 15. He died accidentally, after falling from a tree. He was probably buried at Wawel Cathedral.K. Jasiński: Rodowód Piastów małopolskich i kujawskich, Poznań–Wrocław 2001, p. 16. Odon (1169/1184 - died in infancy). He was probably named after either Odon of Poznań or Saint Odo of Cluny.K. Jasiński: Rodowód Piastów małopolskich i kujawskich, p. 247.S. Pelczar: Władysław Odonic. Książę wielkopolski, wygnaniec i protektor Kościoła (ok. 1193-1239), Wydawnictwo Avalon, Kraków 2013, pp. 62–64. Adelaide (ca. 1177/1184 – 8 December 1211), foundress of the convent of St. Jakob in Sandomierz. Leszek I the White (ca. 1184/1185K. Jasiński: Rodowód Piastów małopolskich i kujawskich, pp. 23-25. – 24 November 1227). Konrad (ca. 1187/1188K. Jasiński: Rodowód Piastów małopolskich i kujawskich, pp. 30-32. – 31 August 1247).

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